Comscore Releases May 2010 U.S. Online Video Rankings

YouTube Streams All-Time High of 14.6 Billion Videos Viewed

RESTON, VA, June 24, 2010 – Comscore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released May 2010 data from the Comscore Video Metrix service showing that 183 million U.S. Internet users watched online video during the month. YouTube.com achieved record levels of viewing activity in May with an all-time high of 14.6 billion videos viewed and surpassing the threshold of 100 videos per viewer for the first time.

Top 10 Video Content Properties by Videos Viewed

U.S. Internet users watched nearly 34 billion videos in May, with Google Sites ranking as the top video property with 14.6 billion videos, representing 43.1 percent of all videos viewed online. YouTube accounted for the vast majority of videos viewed at the property. Hulu ranked second with 1.2 billion videos, or 3.5 percent of all online videos viewed. Microsoft Sites ranked third with 642 million (1.9 percent), followed by Vevo with 430 million (1.3 percent) and Viacom Digital with 347 million (1.0 percent).

Nearly 183 million viewers watched an average of 186 videos per viewer during the month of May. Google Sites attracted 144.6 million unique viewers during the month (101.2 videos per viewer), followed by Yahoo! Sites with 46.0 million viewers (7.3 videos per viewer), and Vevo with 45.6 million viewers (9.4 videos per viewer). Vevo jumped one position in the May ranking taking the #3 spot with 45.6 million viewers and an average of 9.4 videos per viewer.

In May, Tremor Media ranked as the top video ad network with a potential reach of 102.8 million viewers, or 56.2 percent of the total video viewing audience. ScanScout Network ranked second with a potential reach of 99.3 million viewers (54.3 percent penetration) followed by YuMe Video Network with 87.5 million viewers (47.8 percent).

About ComscoreComscore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world and preferred source of digital marketing intelligence. For more information, please visit www.comscore.com/companyinfo.